Electric burglar-alarm system.



ELECTRIC BURGLAR ALARM SYSTEM.

APPLICATION HLED MAY21, 1910. REHEWED Aue. 11,1915.

Patented Feb. 15, 1916.

2 SHEETS-SHEET 1.

1 I I I I I I i. J

I I I 1 I I I I 1 JfP. WILLIAMS.

ELECTRIC BURGLAR ALARM SYSTEhM. APPLICATION FILED MAY 21, 1910. REnEwEDAue. 11,'1915.

1 9 171 ,997 l Patented Feb. 15, 1916.

2 SHEETS-SHEET 2.

UNITED sTATEs PATENT oEEIcE;

JOHN P. WILLIAMS, OF NEW YORK, N. Y., ASSIGNOB. TO ELECTRIC BANKPROTECTION COMPANY, A CORPORATION OF DELAWARE.

ELECTRIC BURGLAB-ALABM SYSTEM.

Specication of Letters Patent.

f Patented Feb. 15, 191e.

Application tiled Hay 21, 1910, Serial No. 562,568. Renewed August 11,1915. Serial No. 415,041).v

To all whom t may concern Be it known that I, JOHN P. WpILLiAMs, acitizen of the United States, and resldent of New York, in the countyand Statel ofv New York, have invented certain new and usefulImprovements in Electric Burglar- Alarm Systems, of which the following1s a specification.

This invention relates to burglar-alarm systems, and it has for itsobject to provide simple and improved means whereby the structure to beguarded will be protected in such a manner that a failure ordisarrangement of one part initially subject to attack will be met bythe automatic throwing into operation of parts liable to subsequentattack.

My inventiomcomprises further improvements in the general effectivenessand economies of electric burglar-alarm systems substantially ashereinafter described and particularly pointed out in the claims.

In the drawings-Figure 1 is a diagrammatic representation of the mainparts of a burglar-alarm system embodying my improvements. Fig. 2 is adetail diagrammatic plan view of the controlling diskmechanism. Fig. 3is a detail edge View showing theconnection of the disk-mechanism withthe mechanically-operating mechanism for actuating the alarm.

Corresponding parts in all the figures are denoted by the same referencecharacters.

Referring to the drawings, the dotted line' 1`indicates the guardedstructure or main structure protected by the burglar-alarm system. Theguarded structure as herein indicated maybe the vault, safe, or otherstructure which it is desired to protect in a bank or other` building,or the building or apartment itself or a. part thereof. In the type ofburglar-alarm systems to which my improvements particularly relate, themain guarded structure l is itself electricallyprotected in a suitablemanner so that an attack upon the same or an attempt to gain entrance`thereto will sound an alarmnthis electrical protection usuallycomprising batteries and circui-ts, switches and relays or other devicesvarranged withln the guardedv structure, and said circuits areconnectedby a cable, usually exposed and itself protected, extending toan alarm structure suitably located and containing the alarm. The alarmstructure is indicated at 2, and it usually comprises a suitable casingcontaining the operative parts of the alarm mechanism. The alarmstructure 2 may be loments whereby auxiliary means will serve to enableactuation of the alarm in case initial conditions of attack should forany reason throw out or cause disarrangement of the parts of the systemthus initially attacked, and my improvements further comprise means forthrowing out of and into circuit such alternately operative protectiveparts and :for controlling the duration of the actuation of the alarmand the preservation of the activity of the batteries or source ofelectrical energy, as will be hereinafter` fully described.

The alarm structure 2, in my invention, embodies a casing forming aninclosure the main walls of which consist of an outer plate, 3, which isin electrical connection with one side of a circuit, and a plurality ofinner plates which are in electrical connection with the opposite sideof said cir-b cuit, two of such inner plates being herein shown andrespectively designated 4 and 5. Said plates are separated from eachother a` suitable distance, and the outer plate 3 is suitably insulatedfrom the first inner plate 4, as at 6, and the plate 4 is suitablyinsulated from the `second linner plate 5, as at 7. Within thisstructure 2 is arranged the alarm signal, which is herein shown asconsisting of a suitably-mounted l I preferably arrange within the alarmstructure or housing 2 all the parts of the electrical mechanism wherebythe casin l plates, 3, 4 and 5, are electrically-protecte and connectedin their circuit arrangements, including the battery or source ofelectrical energy whereby said circuits are operated, and thus the alarmstructure is operatively protected entirely within itself and withoutdependency upon any external or supplementary source of electricalconnection or current supply and independently of the main protectedstructurel and of the circuit connections between said main protectedstructure and the protectedV alarm structure, the thus substantial y thesame as those set forth and covered in my copending application forpatent filed April 27, 1910, Serial No. 558,035, which has eventuated ina Patent, No. 1,115,359, granted Oct. 27, 1914, in which the protectedalarm structure constitutes in litself an independent and effectiveburglaralarm system whereby the alarm cannot be disabled without thesounding thereof, in case of an attack upon the alarm structure,whatever may be the electrical conditions of the main guarded structurel'or the circuits in the connecting cable extending therefrom. In thecircuit connections and arrangement thus housed within the alarmstructure 2, as herein. shown, is comprised a battery or source ofelectrical energy, as at 9, an electro-magnet device, as at 10, ingeneral of usual construction, a relay, as at 11, and 'a mechanicalmeans, as at 12, for actuating a hammer, as at 14, for sounding thealarm. Such mechanical means may be in the main of any suitable oradapted construction, for instance an arrangement similar to that shownin the application for patent filed by M. F. Juruick, August 16, 1907,Serial No. 388,788, and as herein illustrated said mechanical meanscomprises a spring-motor, 15, adapted to actuate said hammer 14, whichis pivotally mounted to swing in contact with the gong 8, saidspring-motor being normally locked by the engagement of a revolubleratchet disk, 16, comprised in said motor mechanism, with the armature,17, of the electro-magnet device 10, the construction and arrangementbeing such that the operation of said armature will release.

said ratchet-disk and permit the operation of said motor mechanism toeffect the sounding of the alarm.

The front of the protected alarm structure 2 is preferably of open-workconstruction, as is usual with these structures, to permit the emissionof sound when the alarm is operated, and in the construction as hereinillustrated I have shown a preferred form in which an open shutter, 18,is formed of a series of inclined plates in relatively-overlappingposition, and in rear thereof is arranged a protective wire network, 19,backed by a perforated plate, 20. The frontportion of the protectedalarm structure 2 may be mounted and secured in any suitable manner, andpreferably comprises a face-plate,

21, to which the members 18, 19 and 20 are connected and which isadapted to normally contact with the outer casing plate 3, while themembers 19 and 20 are respectively in electricalconnection with thefirst inner casing plate 4 and the second inner casing plate 5, as shownat 22 and 23, and the member 20 rotective conditions being is suitablyinsulated from the member 19,

be understood that the general construction and arrangement is such thatan attempt to drill through the casing of the protected alarm structurewhereby a metallic instrument is brought into contact with the outerplate 3 and the first inner plate 4 or the outer plate 3 and the secondinner plate 5 will also` sound the alarm through the cir cuitconnections hereinafter described. The front portion of the protectedalarm structure 2 is movably mounted with relation to the casing of thestructure, for instance, it may be constituted by a hinged door com``prising the members 18, 19 and 20, and to providefor sounding the alarmwhen said front portion is moved away from the casing of the structure 2said movable door or frontl portion is provided with two sets ofcontacts, as at 26 and 27 respectively, the first set being adapted toestablish electrical circuit connection between the outer casing plate 3and the first inner casing plate 4, while the second set 27 is adaptedto establish electrical circuit connection between the outer casingplate 3 and the second inner casing plate 5. The circuit arrangement ofsaid, door contacts 26 and 27 may be in any suitable or` adapted manner,and said contactsmay consist of lugs, as at 28, projecting inwardly andoperating to normally maintain spring contacts, as at 29,/open, where`by when the lugs 28 move outwardly from the spring contacts 29the'latter are released and close the circuits of said door contacts andthus cause thev sounding of the alarm,

In general, theV circuit arrangements'of the devices comprised in theprotected alarm structure 2 may be of any suitable or adaptedconstruction whereby the alarm will bc sounded under the operativeconditions hereinafter set forth. I have herein shown a circuitarrangement in which a' wire` 30, extends from one side of the battery 9to the outer casing plate 3, and from the other side ofthe battery awire, 31, extends to the coil of the electro-magnet 10, and from thecoil of said electro-magnet a wire, 32, ex-

ent invention and improvements, substantially as will be hereinafterfully set forth. In the circuit arrangements as nowl described, twoother spring contacts, 34 and 35, respectively operate in connectionwith said rotary disk-arrangement, and from these spring contacts wiresrespectively extend to the lirst inner casing plate 4 and the secondinner casing plate 5, as at 36 and 37. .From the armature, 38, of therelay- 11, extends a wire, 39, to the wire 30, and from a contact, 40,with relation to which said armature operates, extends a wire, 41, to arelay spring contact, 42, operating with relation to said rotarydisk-mechanism, and wires, as at 43 and 44, comprised in a closedcircuit, extend to said relay 11. The circuit arrangements as herein,shown further comprisefa contact, 45, carried by the armature 17 of theelectro-magnet 10 and operating with relation to a contact, 46, whichcontact 45-46 is normally open, and from the contact 46 extends a wire,47, and from said armature 17 extends a wire, 48, which wires 47 and 48are comprised in an open circuit and lead to and are in suitableconnection with the genera-l -electric protec Vtive system by Which themain guarded structure 1 is itself protected.

I have herein shown the preferred arrangement in which all the parts ofthe mechanism for the protection of the casing plates of the protectedalarm structure 2 are mounted within said structure 2, whereby saidalarm structure is completely pro-Y tected electrically independent of4any cir cuit connections or devices which may be comprised in thegeneral electric protective system by wh1ch the main guarded structure lis itself electrically protected. In this connection, it will beunderstood that the closed-circuit wires 43 and 44 and the open-circuitwires 47 and 48 lead to and are included in any general electricprotective system by which the main guarded structure 1 may be itselfelectrically protected, and thatsaid` circuits have their source ofelectrical energy or batteries in such general electrical protectivesystem with which they are connected, the usual arrangement of thebatteries being within the main guarded structure 1, as shown in thesystem 'for the protection of such guarded structures 1 which isillustrated and. described in the Juruick application for patenthereinbefore mentioned. It is manifest, however, that if desired' thebatteries or source of electrical energy for the closed circuitincluding the wires 43 and 44 and the open circuit including the Wires47 and 48 could be housed within the protected alarm structure 2. y

The disk arrangement hereinbefore re- I ferred to comprises a disk, 49,adapted to be rotated by connection with one of the shafts,l

50, of the spring motor mechanism for actuating the mechanical means forsounding the alarm.l Said disk carries upon its face a series ofsegmental ways, preferably constituted by Aa metallic plate, as at 51,for establishing circuit connection between the spring contactshereinbefore mentioned and which operate with relation to sald disk, andthe remaining surface of said disk is of insulating material, as at 52.The arrangement ofthe segmental ways 'of the plate 51 is clearly shownin Fig. 2, and this arrangement preferably comprises a larger segment,53, adapted to conjointly receive the spring contacts 33 and 34, asmaller segment, 54, separated from the segment 53 by an insulatingsegmental surface space and adapted to receive the relay spring contact42, and a largersegment, 55, extending from the segments 53 and 54 andadapted to conjointly receive the spring contacts 33, 35 and 42. In therelative arrangement, the spring contact 33 projects in one .directionwith re-v mal position it will protect the alarm structure vby means ofthe outer casing plate 3 and the irstinner casing plate 4 and the firstseries of contacts 26 which are controlled by the movable front part ordoor of said casing, and also the circuit through the relay. connection11. `When operative .under the conditions just stated, should thecircuit through the first inner/ lining 4 become closed by reason ofattack or in any other manner, the mechanical means for sounding thealarm will operate until the rotation of the disk 49 causes the springcontact 34 to pass from the segment 53 to the insulated portion 52 atthe terminal point of said segment indicated at 56, whichhwill cut outof circuit the first inner lining 4 and connect in circuit the secondinner lining 5, by reason of the concurrent passage of the springcontact 35 from the insulated portion between the segments 53 and 54 tothe larger ,segment 55, which action will of course also connect incircuit the second series of contacts 27 which are controlled by themovable front portion or door of the alarm housing 2 and will againconnect in circuit the relay connection through the spring contact 35and the second inner lining 5 instead of the previous connection throughthe spring contact 34 and the first inner lining 4, itbeing noted thatthe relay spring contact 42 passes directly from the smaller seg# ment54 to the larger segmentl 55.` The general operation of the mechanism,as just indicated, is therefore such that in case one set of theprotected plates of the alarm housin 2, for instance the outer casingplatev 3 an the inner casing plate 4, becomes short circuited in anymanner or for any reason, for instance by an attack or in case ,of anattempt to drill through the same, the disk mechanism 49 changes by itsrevoluble action the circuit connections from said first set of platesand throws them out of circuit and in their stead throws in circuit asecond set of such plates, for instance the outer casing plate 3 and thesecond inner casing plate 5.

It will be understood that my invention and improvements are notrestricted in their application to two inner linings, as at 4 and 5, orto two sets of .contacts which Aare 'controlled by the movable frontportion or door of the alarm housing 2, but that the mechanism can bearranged for operation with v relation to any desired plurality of innerlinings or sets of door contacts, as will be readily understood, throughan arrangement of spring contacts similar to those shown at 34 and 35and in connection with their respective inner casing plates.

The operation and advantages of my inn vention and improvements will bereadily understood by those skilled in the art to which they appertain.The closed-circuit relay 11 normally operates to hold its armature 38from the contact 40, and if the closed circuit should be opened saidarmature is released and establishes connection with the contact 40 andthe current from the battery 9 passes through the wire 39 and throughthe contact 40 and wire 41, the circuit being completed through therelay spring Contact 42 and the plate 51 and spring contact 33 to thewire 32 and through the electro-magnet l0 and wire 31 back to thebattery 9. This" complete circuit energizes the electro-magnet 10 andoperates its armature 17 to release the ratchet or cam disk 16 and thuspermit the operation of the spring-motor and mechanical means foroperating the alarm. Then, when the contact 42 moves off the plate 51,the armature 17 will be released and will return to normal position,Aand the operation of the mechanical means will stop as soon as therotation of the ratchet-disk 16 brings it again in locked connectionwith said armature 17.

It will be noted that, when the relay 11 becomes operative by theopening of its closed circuit, the completed circuit from this relay asabove described will eXist as long as the relay spring contact 42remains in contact with the segments 54 and 55 upon the revoluble disk49, but that in case the circuit through the relay 11 is not restored toits normal closed condition, whereby the protected status, and an attackupon -thev same by drilling or otherwise which short circuits the casingplates thereof will of course operate to start the mechanical means inoperation to sound the alarm and actuate the disk 49, through a circuitcomprising the wire V30, battery 9, wire 31, electro-magnet 10, wire 32,spring contact33, the disk-mechanism 49, and one or the other of springcontacts 34 or 35 and the connection thereof with the housing plates. Ifsuch short circuit through an attack upon the housing plates becomescontinuous or is maintained and not removed, the disk 49 will continuein action and will operate to break the circuit which has beenestablished through the housing plates when the spring contacts 34 or 35pass from the segments 53 `or 55 to the insulated portion of the disk 59at the points indicated at 56 or 59, which action disconnects thebattery 9 from the circuit extending through the housing plates yandthus prevents the batteries from becoming dead by long continuance ofthe short circuit established by an attack upon the housing plates asabove described. Therefore, under the conditions just stated, it` wouldbe simply necessary to remove the short circuit conditions, re-wind thespringmotor and repair the connections, if necessary, as the battery 9.would be preserved as a direct result of the action of the cut-out ofthe spring contacts 34 or 35 at the points 56 or 59. It willbe/understood that when Ithe battery 9 is .cut out as above stated andthe current is withdrawn from .the electro-magnet 10, the'armature 17 ofthe latter is released and the action of the ratchet-disk 16 withrelation to its locking connection with said armature operates to lockthe springmotor which actuates the mechanical means for sounding thealarm and operates the revoluble disk 49. The adjustment of thespring-motor mechanism. may be such that one complete operation of sucha mechanism will be related to several revolutions of the 4ratchet-disk16, whereby the circuit conditor, or the adjustment may be such that theratchet-disk 16 has but one revolution with relation to one]v completeoperation of the spring-motor mechanism,'according to cir Ycumstancesand cond1t1ons or as desired 1 n' the adaptation of the device tovarious'conditio ns of use.

It will be noted that the arrangement of the segments'of therevolubledisk 49 is such that the springcontact 33 will remain in kcontact withthe segments 53 andf'55 with relation to the period of contact of thespring contact 34 with the segment 53 and the period of contact of thespring contact 35 with the segment 55, before said spring contact 33passes from the segment 55 at the point indicated'at 58.

It will be understood that my improvements as herein described, forcontrolling the circuits of the plurality of inner casing plates of theprotected structure and for successively or alternately protecting thesame, are not restricted to the employment of an open circuit but areadaptable for'use on a closed circuit or on a .combined arrangement ofboth open and closedv circuits, as will be readily understood by thoseversed inl the art.

My improved means for automatically cutting out certain sections ofthe'.casing plates of the protected housing or structure and substitutingother sections thereof, involving the revoluble disk-mechanism and thecontrolling spring contacts operating with relation thereto in theirrespective circuit connections, is of particular advantage in itsapplication tothe alarm housings or structures of burglar-alarmsystems,as its operative action results in the controlling of the operation ofthe mechanical means for sounding the alarm and of the batteries forcertain periods of time, whereas without this control if the mechanicalmeans were once started the operation thereof and sounding of the alarmwould continue until said means was mechanically shut oit or thebatteries became dead. The latter conditions are obviated by theimproved controlling means and circuit arrangements as comprised in mypresent invention.

I do not desire to be understood as limit-l ing myself to the detailconstruction andarrangement of parts or circuits as herein shown anddescribed, as it is manifest that variations and modifications thereinmay be resorted to, in the adaptation of my invention to varyingconditions of use, without 'casing plates and with said alarm mecha--tively with said alarm mechanism during plates comprised in saidstructure, an electrically-controlled alarm mechanism, an electricalprotective system comprising circuit connections'` with said respectivesets of,

nism, one set` of said casing plates being normallyfconnected with andanother set normally disconnected from said alarm mechanism, and meansgoverned by the action of the circuit which controls the alarm mechanismfor automatically varying said circuit connections to throw said sets ofcasing plates outof and into circuit respectively with said alarmmechanism.

2. In aburglar-alarm system,a structure to be guarded, a plurality ofsets of casing plates comprised in said structure, anelectrically-controlled alarm mechanism, an electrical protective'systemcomprising circuit connectionswith said respective sets of casing,plates and withsaid alarm mechanism, one set of said casing plates beingnormally connected with and another set normally disconnected from saidalarm mechanism, andar, means governed by the action of the circuitwhich controls the alarm mechanism for automatically varying saidcircuit connections to throw said sets of casing plates out of and intocircuit respec- 495 the period saidl circuit connections are operatlvewlth relation to the casing plates.

3. In a burglar-alarm system, a structure to be guarded, a plurality ofsets of casing plates comprised in said structure, an elec- 100.

trically-controlled alarm mechanism, an electrical protective systemcomprising circuit connections with said respective sets of casingplates and-with said alarm mechanism, one set of said casing platesbeing normally connected with and another set normally disconnected fromsaid alarm mechanism, and means governed by the action of the circuitwhich controls the alarm mechanism for automatically and successivelyvarying said circuit connectionsv to throw said sets of casing yplatesout of and into circuit respectively with said alarm mechanism.

4l. In a burglar-alarm system, a structure to be guarded, a plurality ofsets of casing plates comprised in said structure, anelectrically-controlled alarm mechanism, an

electrical protective system comprising circuit connections with saidrespective sets of casing plates and with said alarm mech- 12 anism, oneset of saidcasing plates being normally connected with and another setnormally disconnected from said alarm mechanism, and means governed bythe action of the circuit which controls the alarm mechanism forautomatically and alternately varying said circuit connections to throwsaid sets of casing plates out of and into circuit respectively withsaid alarm mechanism.

5. In a burglar-alarm system, a structure to be guarded, a plurality ofsets of casing vplates comprised in said structure, anelectricallycontrolled alarm mechanism, an electrical protectivesystemcomprising circuit connections with said respective sets of casingplatesiand with said alarm mechanism, one set of said casing platesbeing normally connected with and another set normally disconnected fromsaid alarm mechanism, a plurality of contacts comprised in said circuitconnections, and rotary mecha-- nism governed by the action of thecircuit which controls the alarm mechanism and automatically operatingto vary the circuit connections of said contacts to throw said sets ofcasing plates out of and into circuit respectively with said alarmmechanism. y

6. In a burglar-alarm system, a structure to be guarded, a plurality ofsets of easing plates comprised in said structure, anelectrically-controlled alarm mechanism, mechanically-operating meanscomprised in said alarm mechanism Jfor actuating the alarm, anelectrical protective system comprising circuit connections with saidrespective sets of casing plates and with said alarm mechanism, one setof said vcasing plates being normally connected with and another setnormally disconnected from said alarm mechanism, and means actuated bysaid mechanically-operating means to auto matically vary said circuitconnections to throT said sets of casing plates out of and into circuitrespectively with said alarm mechanism.

7. In a burglar-alarm system, a structure to be guarded, a plurality ofsets of casing plates comprised in said structure, anelectrically-controlled alarm mechanism, mechanically-operating meanscomprised in said alarm mechanism for actuating the alarm, an electricalprotective system comprising circuit connections with said'respectivesets of casing plates and with said alarm mechanism, one set of saidcasing plates being normally connected with and another set normallydisconnected from said alarm mechanism, a plurality oit contactscomprised in said circuit connections, and means actuated by saidmechanicallyoperating means to automatically vary the circuitconnections of said contacts to throw said sets of casing plates out ofand into circuit respectively with said alarm mechanism.

8. In a burglar-alarm system, a structure to be guarded, casing platescomprised in said structure, an electrically controlled alarm mechanism,mechanical means comprised in said alarm mechanism for actuating thealarm, an electricalprotective sys- .tem comprising circuit connectionswith said casing plates and With said alarm mechanism, some of saidcasing plates being normally connected With and others normallydisconnected from said alarm mechanism, and means actuated by saidmechanicallyoperating means Ato automatically vary said circuitconnections to throw said casing plates out of and into circuitrespectively with said alarm mechanism.

9. In a burglar-alarm system, a' structure to be guarded, casing lplatescomprised in said structure, an electrically controlled alarm mechanism,means comprised insaid alarm mechanism for actuating the alarm, anelectrical protective system comprising circuit connections with saidcasin plates and with said -means for actuating the alarm, some of saidcasing plates being. normally connected with and others normallydisconnected from said alarm mechanism,

land means actuated by said means for actul0. In aburglar-alarm system,a structure y to be guarded, a plurality of sets of protective memberscomprised in said structure and adapted yto complete electrical circuitswhen yconnection is established between the members of said respectivesets, an electrically-controlled alarm mechanism, an electricalprotective system comprising circuit connections with said respectivesets of protective members and with said alarm mechanism, one set ofsaid protective members being normally connected with and another setnormally disconnected from said alarm mechanism, and means vgoverned bythe action of the circuit which controls the alarm mechanism toautomatically vary said circuit connections to throwl said sets ofprotective members out of and into circuit respectively vwith said alarmmechanism.

l1. In a burglar-alarm system, a structure f to be guarded, saidstructure comprising an outer casing member and a plurality of innercasing members, an electrically-conmembers being normally connected withand another of said inner casingvmembers being normally disconnectedfrom said alarm mechanism, and means governed by the laction of thecircuit which controls the alarm mechanism to automatically vary saidcircuit connections to throw said inner casing members out of and intocircuit respectively with said alarm mechanism.

12. Ina burglar-alarm system, a structure to be guarded, said structurecomprising an outer casing member and a plurality of inner casingmembers, said casing members being relatively successively located, anelectrically controlled alarm mechanism, an electrical protective systemcomprising circuit connections with said alarm mechanism and with saidcasing members whereby a circuit will be completed when connection isestablished between said outer casing member and the first inner casingmember, said first innercasing member being normally connected with andthe other inner casing members bel ing normally disconnected from saidalarm mechanism, and means to vary said circuit connections tosuccessively throw said inner ,Y

casing members out of and into circuit respectively with said alarmmechanism.

13. In a burglar-alarm system, a structure.

to be guarded, said structure comprising a plurality ofsuccessively-arranged casing plates, an electrically-controlled alarmmech"- anism, an electrical protective systemcomprising circuitconnections with said alarm mechanism and with said casing plates, someof said casing plates being normally con-A nected with and othersnormally disconnected from 4said alarm mechanism, and means for varyingsaid circuit connections to throw said casing platesout of and intocircuit respectively with said alarm mechanism, whereby when two of saidcasing plates are in circuit connection and the circuit is completedtherethrough another 'of said casing plates will be substituted for oneof the casing -plates which is in said completed circuit.

14. In a burglar-alarm system, a structure to be guarded, said structurecomprising a plurality of sets of casing members, anelectrically-controlled alarm mechanism, a door.

or movable portion for said casing structure to permit access thereto, aplurality of sets of circuit contacts actuated by the movement of saidaccess member, an electrical protective system comprising circuitconnections with said alarm mechanism and with said respective sets ofcasing members and with said respective sets of circuit contacts, oneset of said casing members and of said circuit contacts being normallyconnected with and another of said sets normally disconnected from saidalarm mechanism, and means -governed by the action of the circuit whichcontrols the alarm mechanism to automatically vary said circuitconnections to throw said sets of casing members and circuit contactsout of and into circuit respectively with said alarm mechanism.

l5. In a burglar-alarm system, a structure to be guarded, a door ormovable portion for said structure to permit access thereto, anelectrically-controlled alarm-mechanism, a plurality of circuit contactsactuated b v the movement of 'said access member,'an electricalprotective system comprising circuit connections with said alarmmechanism and with said respective circuit contacts, some of Saidcircuit contacts being normally con-.

nected with and others normally disconnected from said alarm mechanism,and means governed by the, action of the circuit which controls thealarm mechanism to automatically vary said circuit connections to throwsaid circuit contacts out of and into circuit respectively. with saidalarm mechanism.

16. In aburglar-alarm system, a structure to be guarded; a plurality ofsets of casing members comprised in said structure; an`

electrically-controlled alarm mechanism; an electrical protective systemcomprising circuit connections with said respective sets of casingmembers and said alarm mechanism,

-said circuit connections including alarmcontrolling means, one set ofsaid casing members being normally connected with and another l,setnormally disconnected from, said alarm-controlling means; means governedby the action of the means which controls the alarm mechanism tovary-said circuit connections to ,throw said sets of casing members outof and into circuit respectively with said alarm mechanism; anormally-closed circuit, 43-44, including a relay, 1l; a circuit,4-7-48, having a normally-open connection, 45-46, which normally-openconnection is adapted to be closed by action of the alarm-controllingmeans; and means controlled by said relay 11 whereby thealarm-controlling means is energized and the normally-open circuit isthereby closed when said no-rmally-closed circuit is open.

17. I-n a burglar-alarm system, a structure to be guarded; a pluralityof sets of casing members comprised in.. said structure; -an

electrically-controlled alarm mechanism; an

electrical protective system comprising circuit connections with saidrespective sets of casing members and said alarm mechanism, said circuitconnections including alarmcontrolling means, one -set of said casingmembers being normally connected with and controlling means is energizedand the normally-open circuit is closed when said normally-closedcircuit is opened independent ofthe circuit conditions of that part ofthe electrical system whereby said respective sets of casing members arein circuit with said alarm-controlling means.

18. In a burglar-alarm system, a structure to be guarded, a piurality ofsets of casing' members comprlsed in said structure, anelectrically-controlled alarm mechamsm, an

electrical protective system comprising cir-L cuit connections with saidalarm mechanism and with said respective sets of casing mem.- bers, oneset of said casing members being normally connected with and/.anotherset normally disconnected from said alarm mechanism, means governed byy' the action of the circuit which controlsthe alarm mechanism toautomatically vary said circuit connections to throw said sets of casingmembers out of and into circuit respectively with saidL alarm mechanism,and means for automatically cutting out the battery or source of energyJfor the circuit connections yof said casing members after a determinedperiod. of completed circuit therethrough.

19. In a burglar-alarm system, a' structureto bevguarded, anelectrically-controlled alarm mechanism, an electrical protective systemcomprising a plurality of protective sections for said structure to beguarded and circuit connection with said respective sections and with.said alarm mechanism, some of said protective sections being normallyconnected With and others normally disconnected from said alarmmechanism, and means governed by the action of the circuit Whichcontrols thealarm mechanism to automatically vary said circuitconnections to throw said protective sections out of and into circuitrespectively with said alarm mechanism.

20.. Ina burglar-alarm system, a structure.

to be guarded, an electrically-controlled alarm mechanism, an electricalprotectivev system comprising a plurality of protective sections forsaid structure to be guarded and circuit connections Wlth saidrespective secyeinem tions and with said alarm mechanism, some of saidprotective sections being normally connected with and others normallydisconnected from said alarm mechanism, and. means governed by theaction of the circuit which controls the alarm mechanism toautomatically vary said circuit connections to alternately throw saidprotective sections out of and into circuit respectively With said alarmmechanism.

2l. In ahburglar-alarm system, a structure'to be guarded, an uelectricalprotective system comprising a plurality of protective sections for saidstructure to be guarded, an electrically controlled alarm mechanism,mechanically-operating means comprised in 'said alarm mechanism, foractuating the alarm, said electricalprotective systemv having circuitconnections With said respective protective'sections and With saidmechanical means for actuatingthe alarm, some of saidprotective'sections being normally connected with land others normallydisconnected Afrom said alarm mechanism, a battery or source ofelectrical energy comprised in said. circuit connections, and meansactuated by said mechanically-operating means to automatically vary saidcircuit connections to throw said rotective sections out of and pintocircuit respectively with saidl alarm mechanism and to cut out thebattery or source of electrical energy after a determined period ofoperation of said mechanical means..

In .testimony whereof I have signed my name in the presence of thesubscribing Witnesses.`

J @HN P. WILLIAMS.`

Witnesses:

FREDERICK A. SMITH, WALTER W. NORMANDY.

